A hydraulic turbine governing system and a governing method

Abstract

The application provides a water turbine speed regulation system and a speed regulation method. The system comprises a water turbine speed regulator, the water turbine speed regulator comprising a first control signal generation module, a second control signal generation module and a guide vane switch control module; the first control signal generation module and the second control signal generation module are both used for generating a hydraulic control signal of a water turbine guide vane and sending the hydraulic control signal to the guide vane switch control module; the guide vane switch control module is used for receiving the hydraulic control signal and controlling the opening and closing of the water turbine guide vane based on the hydraulic control signal, thereby realizing the speed regulation of the water turbine. The technical scheme provided by the application adopts a parallel redundancy mode, is simple in logic, reliable in operation, convenient for fault classification and differentiation, reduces the failure rate of the water turbine speed regulator, improves the reliability of the system and guarantees the safe and stable operation of the water turbine generator set.

Description

Technical Field

[0001] This application relates to the field of turbine speed regulation technology, and in particular to a turbine speed regulation system and method. Background Technology

[0002] The turbine governor is one of the most important auxiliary control devices in a hydro-generator unit, and its operational quality directly affects the safe and stable operation of the unit. Reducing the failure rate of the turbine governor is the most effective way to improve the reliability of the unit's operation.

[0003] The dual-controller redundancy configuration and the cross-redundancy control method for guide vane servo valves are among the most widely used governor control methods in hydropower plants. However, long-term operation has revealed that the cross-redundancy control method involves complex wiring and logic, requires sophisticated diagnostic criteria, cannot switch the entire control link when some components in the control loop fail, and has low equipment utilization. Furthermore, its fault logic and transmitted monitoring signals are incomplete, hindering real-time monitoring of governor faults and fault analysis and handling under fault conditions. Summary of the Invention

[0004] This application provides a turbine speed regulation system and method to at least solve the technical problems of cross-redundant control methods, such as complicated wiring, complex logic, low equipment utilization, and difficulty in fault analysis and handling.

[0005] The first aspect of this application provides a turbine speed regulation system, including: a turbine speed governor, the turbine speed governor including a first control signal generation module, a second control signal generation module and a guide vane switch control module;

[0006] The first control signal generation module and the second control signal generation module are respectively connected to the guide vane switch control module;

[0007] Both the first control signal generation module and the second control signal generation module are used to generate hydraulic control signals for the turbine guide vanes and send the hydraulic control signals to the guide vane switch control module.

[0008] The guide vane switch control module is used to receive the hydraulic control signal and control the opening and closing of the turbine guide vanes based on the hydraulic control signal, thereby realizing the speed regulation of the turbine.

[0009] When the first control signal generation module fails, the second control signal generation module is used to generate the hydraulic control signal for the turbine guide vanes.

[0010] Preferably, the first control signal generation module includes: a first PCC controller, a first power amplifier board, and a first proportional servo valve;

[0011] The first PCC controller, the first power amplifier board, and the first proportional servo valve are connected in sequence.

[0012] The first PCC controller is used to send electrical control signals to the first power amplifier board;

[0013] The first power amplifier board is used to amplify the electrical control signal and send the amplified electrical control signal to the first proportional servo valve.

[0014] The first proportional servo valve is used to convert electrical control signals into hydraulic signals.

[0015] Furthermore, the second control signal generation module includes: a second PCC controller, a second power amplifier board, and a second proportional servo valve;

[0016] The second PCC controller, the second power amplifier board, and the second proportional servo valve are connected in sequence;

[0017] The second PCC controller is used to send electrical control signals to the second power amplifier board;

[0018] The second power amplifier board is used to amplify the electrical control signal and send the amplified electrical control signal to the second proportional servo valve;

[0019] The second proportional servo valve is used to convert electrical control signals into hydraulic signals.

[0020] Furthermore, the turbine speed control system also includes: a first guide vane displacement sensor, a second guide vane displacement sensor, and a third guide vane displacement sensor;

[0021] The first guide vane displacement sensor, the second guide vane displacement sensor, and the third guide vane displacement sensor are respectively connected to the guide vane switch control module;

[0022] The first guide vane displacement sensor, the second guide vane displacement sensor, and the third guide vane displacement sensor are all used to collect the displacement of the turbine guide vanes.

[0023] Furthermore, the turbine speed control system also includes: a monitoring module;

[0024] The monitoring module is used to collect real-time operating data of the turbine and turbine governor, perform fault diagnosis on the turbine governor based on the operating data, and then control the turbine governor based on the diagnosis results.

[0025] Furthermore, the monitoring module includes: a monitoring submodule, a fault diagnosis submodule, and a fault control submodule;

[0026] The monitoring submodule is used to collect real-time operating data of the turbine and turbine governor;

[0027] The fault diagnosis submodule is used to diagnose faults in the turbine governor based on the operating data.

[0028] The fault control submodule is used to control the turbine governor based on the fault diagnosis results.

[0029] Furthermore, the fault diagnosis submodule includes: a first fault diagnosis unit, a second fault diagnosis unit, and a fault level classification unit;

[0030] The first fault diagnosis unit is used to diagnose whether the PT, toothed disc, guide vane, turbine generator power, first proportional servo valve, second proportional servo valve and guide vane switch control module involved in turbine speed regulation are faulty based on the operating data.

[0031] The second fault diagnosis unit is used to determine the fault type of the PT, toothed disc, guide vane, turbine generator power, first proportional servo valve, second proportional servo valve and guide vane switch control module according to the operating data;

[0032] The fault level classification unit is used to determine the fault level to which the fault diagnosis result belongs.

[0033] Furthermore, the fault types of the PT include: open circuit fault, jump fault, and deviation fault;

[0034] The fault types of the gear disc include: open wire fault and jump fault;

[0035] The fault types of the guide vanes include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, limit overrun fault, and deviation fault.

[0036] The fault types of the hydro-generator unit power include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, and limit over-limit fault.

[0037] The fault types of the first proportional servo valve, the second proportional servo valve, and the guide vane switch control module include: open circuit fault and dead value fault.

[0038] Furthermore, the turbine speed control system also includes an alarm module;

[0039] The alarm module is used to perform fault alarms for the first proportional servo valve or the second proportional servo valve based on the fault diagnosis results, and / or fault alarms for the guide vane switch control module, and / or early warning of active power fluctuations in the hydro-generator unit, and / or guide vane fluctuation alarms.

[0040] A second aspect of this application provides a method for regulating the speed of a water turbine, the method comprising:

[0041] Obtain the control information corresponding to the turbine guide vanes;

[0042] The control information is processed by the first control signal generation module to obtain the hydraulic control signal of the turbine guide vane;

[0043] Based on the hydraulic control signal, and by using the guide vane switch control module to control the switching of the guide vanes, the speed regulation of the turbine is achieved.

[0044] When the first control signal generation module fails, the second control signal generation module is used to process the control information.

[0045] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0046] This application proposes a turbine speed regulation system and method. The system includes a turbine governor, which comprises a first control signal generation module, a second control signal generation module, and a guide vane switch control module. The first and second control signal generation modules are respectively connected to the guide vane switch control module. Both modules generate hydraulic control signals for the turbine guide vanes and send these signals to the guide vane switch control module. The guide vane switch control module receives the hydraulic control signals and controls the opening and closing of the turbine guide vanes based on these signals, thereby achieving turbine speed regulation. When the first control signal generation module fails, the second control signal generation module generates the hydraulic control signals for the guide vanes. The proposed solution employs a parallel redundancy approach, resulting in simple logic, reliable operation, and easy fault identification. It also reduces the failure rate of the turbine governor, improves system reliability, and ensures the safe and stable operation of the turbine generator unit.

[0047] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0048] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0049] Figure 1 This is a first structural diagram of a turbine speed regulation system according to an embodiment of this application;

[0050] Figure 2This is a second structural diagram of a turbine speed regulation system according to an embodiment of this application;

[0051] Figure 3 This is a third structural diagram of a turbine speed regulation system according to an embodiment of this application;

[0052] Figure 4 This is a structural diagram of a monitoring module provided according to an embodiment of this application;

[0053] Figure 5 This is a structural diagram of a fault diagnosis submodule provided according to an embodiment of this application;

[0054] Figure 6 This is a fourth structural diagram of a turbine speed regulation system according to an embodiment of this application;

[0055] Figure 7 This is a flowchart illustrating a turbine speed regulation method according to an embodiment of this application;

[0056] Figure label:

[0057] The system comprises the following modules: First Control Signal Generation Module 1, Second Control Signal Generation Module 2, Guide Vane Switch Control Module 3, First PCC Controller 1-1, First Power Amplifier Board 1-2, First Proportional Servo Valve 1-3, Second PCC Controller 2-1, Second Power Amplifier Board 2-2, Second Proportional Servo Valve 2-3, First Guide Vane Displacement Sensor 4, Second Guide Vane Displacement Sensor 5, Third Guide Vane Displacement Sensor 6, Monitoring Module 7, Monitoring Submodule 7-1, Fault Diagnosis Submodule 7-2, Fault Control Submodule 7-3, First Fault Diagnosis Unit 7-2-1, Second Fault Diagnosis Unit 7-2-2, Fault Level Classification Unit 7-2-3, Alarm Module 8, and Turbine Speed ​​Regulator 9. Detailed Implementation

[0058] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0059] This application proposes a turbine speed regulation system and method. The system includes a turbine governor, comprising a first control signal generation module, a second control signal generation module, and a guide vane switch control module. The first and second control signal generation modules are respectively connected to the guide vane switch control module. Both modules generate hydraulic control signals for the turbine guide vanes and send these signals to the guide vane switch control module. The guide vane switch control module receives the hydraulic control signals and controls the opening and closing of the turbine guide vanes based on these signals, thereby achieving turbine speed regulation. When the first control signal generation module fails, the second control signal generation module generates the hydraulic control signals for the guide vanes. The proposed technical solution employs a parallel redundancy approach, resulting in simple logic, reliable operation, and easy fault identification. It also reduces the failure rate of the turbine governor, improves system reliability, and ensures the safe and stable operation of the turbine generator unit.

[0060] The following description, with reference to the accompanying drawings, illustrates an embodiment of a water turbine speed regulation system and method.

[0061] Example 1

[0062] Figure 1 This is a structural diagram of a turbine speed regulation system according to an embodiment of this application, as shown below. Figure 1 As shown, the system includes: a turbine governor 9, which includes a first control signal generation module 1, a second control signal generation module 2, and a guide vane switch control module 3;

[0063] The first control signal generation module 1 and the second control signal generation module 2 are respectively connected to the guide vane switch control module 3;

[0064] The first control signal generation module 1 and the second control signal generation module 2 are both used to generate hydraulic control signals for the turbine guide vanes and send the hydraulic control signals to the guide vane switch control module 3.

[0065] The guide vane switch control module 3 is used to receive the hydraulic control signal and control the opening and closing of the turbine guide vanes based on the hydraulic control signal, thereby realizing the speed regulation of the turbine.

[0066] When the first control signal generation module 1 fails, the second control signal generation module 2 is used to generate the hydraulic control signal for the turbine guide vanes.

[0067] In the embodiments disclosed herein, such as Figure 2As shown, the first control signal generation module 1 includes: a first PCC controller 1-1, a first power amplifier board 1-2, and a first proportional servo valve 1-3;

[0068] The first PCC controller 1-1, the first power amplifier board 1-2, and the first proportional servo valve 1-3 are connected in sequence;

[0069] The first PCC controller 1-1 is used to send electrical control signals to the first power amplifier board 1-2;

[0070] The first power amplifier board 1-2 is used to amplify the electrical control signal and send the amplified electrical control signal to the first proportional servo valve 1-3;

[0071] The first proportional servo valve 1-3 is used to convert electrical control signals into hydraulic signals.

[0072] Furthermore, such as Figure 2 As shown, the second control signal generation module 2 includes: a second PCC controller 2-1, a second power amplifier board 2-2, and a second proportional servo valve 2-3;

[0073] The second PCC controller 2-1, the second power amplifier board 2-2, and the second proportional servo valve 2-3 are connected in sequence;

[0074] The second PCC controller 2-1 is used to send electrical control signals to the second power amplifier board 2-2;

[0075] The second power amplifier board 2-2 is used to amplify the electrical control signal and send the amplified electrical control signal to the second proportional servo valve 2-3;

[0076] The second proportional servo valve 2-3 is used to convert the electrical control signal into a hydraulic signal.

[0077] In the embodiments disclosed herein, such as Figure 3 As shown, the turbine speed control system also includes: a first guide vane displacement sensor 4, a second guide vane displacement sensor 5, and a third guide vane displacement sensor 6;

[0078] The first guide vane displacement sensor 4, the second guide vane displacement sensor 5, and the third guide vane displacement sensor 6 are respectively connected to the guide vane switch control module 3;

[0079] The first guide vane displacement sensor 4, the second guide vane displacement sensor 5, and the third guide vane displacement sensor 6 are all used to collect the displacement of the turbine guide vanes.

[0080] It should be noted that using three guide vane displacement sensors can meet the requirement of independent measurement and a three-out-of-two logical judgment method, and select the optimal value by taking the median of the three.

[0081] Furthermore, such as Figure 3 As shown, the turbine speed control system also includes: a monitoring module 7;

[0082] The monitoring module 7 is used to collect real-time operating data of the turbine and turbine governor, perform fault diagnosis on the turbine governor based on the operating data, and then control the turbine governor based on the diagnosis results.

[0083] Furthermore, such as Figure 4 As shown, the monitoring module 7 includes: a monitoring submodule 7-1, a fault diagnosis submodule 7-2, and a fault control submodule 7-3;

[0084] The monitoring submodule 7-1 is used to collect real-time operating data of the turbine and turbine governor.

[0085] The fault diagnosis submodule 7-2 is used to perform fault diagnosis on the turbine governor based on the operating data.

[0086] The fault control submodule 7-3 is used to control the turbine governor based on the fault diagnosis results.

[0087] It should be noted that, as Figure 5 As shown, the fault diagnosis submodule 7-2 includes: a first fault diagnosis unit 7-2-1, a second fault diagnosis unit 7-2-2, and a fault level classification unit 7-2-3;

[0088] The first fault diagnosis unit 7-2-1 is used to diagnose whether the PT (voltage transformer), gear disc, guide vane, turbine generator power, first proportional servo valve 1-3, second proportional servo valve 2-3 and guide vane switch control module 3 involved in turbine speed regulation are faulty based on the operating data.

[0089] The second fault diagnosis unit 7-2-2 is used to determine the fault type of the PT, toothed disc, guide vane, hydro-generator power, first proportional servo valve 1-3, second proportional servo valve 2-3 and guide vane switch control module 3 according to the operating data;

[0090] The fault level classification unit 7-2-3 is used to determine the fault level to which the fault diagnosis result belongs.

[0091] Furthermore, the fault levels include: Level 1 fault, Level 2 fault, and Level 3 fault; Level 1 fault is a general fault, and when a Level 1 fault is diagnosed, an alarm needs to be triggered.

[0092] The secondary fault is a fault in one of the first control signal generation module 1 or the second control signal generation module 2. When a secondary fault is diagnosed, the system switches to the other generation module.

[0093] The Level 3 fault refers to a failure in both the first control signal generation module 1 and the second control signal generation module 2. When a Level 3 fault is diagnosed, i.e., the machine trips, a shutdown is required.

[0094] In this embodiment of the disclosure, the fault types of the PT include: open circuit fault, jump fault, and deviation fault;

[0095] The fault types of the gear disc include: open circuit fault and jump fault; wherein, the gear disc fault is diagnosed based on the collected gear disc comprehensive signal; when gear disc 2 reports a fault and gear disc 1 does not report a fault, the gear disc comprehensive signal is gear disc 1 signal; when gear disc 1 reports a fault and gear disc 2 does not report a fault, the gear disc comprehensive signal is gear disc 2 signal; when gear discs 1 and 2 do not report a fault, the gear disc comprehensive signal is gear disc 1 signal.

[0096] The fault types of the guide vanes include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, limit overrun fault, and deviation fault.

[0097] The fault types of the hydro-generator unit power include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, and limit over-limit fault.

[0098] The fault types of the first proportional servo valve 1-3, the second proportional servo valve 2-3, and the guide vane switch control module 3 include: open circuit fault and dead value fault.

[0099] For example, when the current value of the corresponding component is detected to be less than zero or greater than 20mA, it can be determined as a wire breakage fault; when the current value of the corresponding component is detected to jump directly from 6mA to 20mA, it can be determined as a jump fault; when the displacement value output by the displacement sensor is detected to deviate from the predetermined displacement value, it can be determined as a deviation fault, etc.

[0100] In the embodiments disclosed herein, such as Figure 6 As shown, the turbine speed control system also includes: an alarm module 8;

[0101] The alarm module 8 is used to perform fault alarms for the first proportional servo valve 1-3 or the second proportional servo valve 2-3 based on the fault diagnosis results, and / or fault alarms for the guide vane switch control module 3, and / or early warning of active power fluctuations in the hydro-generator unit, and / or guide vane fluctuation alarms.

[0102] For example, when the fault diagnosis result is a follow-up fault of the first proportional servo valve 1-3 or the second proportional servo valve 2-3 (e.g., the first proportional servo valve 1-3 or the second proportional servo valve 2-3 is stuck, the deviation between the guide vane setpoint and the guide vane feedback is greater than 5%, the deviation between the servo feedback and the guide vane control output is greater than 1mA, and the delay is 1.5s), servo switching is performed and a servo valve follow-up fault alarm is issued.

[0103] When the fault diagnosis result indicates a follow-up fault in the guide vane switch control module 3 (i.e., the main pressure regulating valve), (when the deviation between the guide vane setpoint and the guide vane feedback is greater than 5%, the main pressure regulating valve feedback action direction is opposite, or the main pressure regulating valve action stroke is less than 10%, and there is a delay of 1.5 seconds, a servo switch is quickly performed to eliminate the situation where the main valve reports a follow-up fault due to servo jamming or malfunction. If the main pressure regulating valve still cannot operate after servo switch, it can be determined that the main pressure regulating valve is jammed or malfunctioning), a follow-up fault alarm for the guide vane switch control module 3 is issued;

[0104] When the fault diagnosis result shows that the power fluctuation value of the hydro-generator unit exceeds the normal set value, an early warning of active power fluctuation of the hydro-generator unit is issued to remind the operation and duty personnel to pay attention or take intervention measures to prevent excessive power fluctuation of the unit from affecting the stable operation of the power grid.

[0105] When the fault diagnosis result is abnormal fluctuation of the guide vane opening, a guide vane fluctuation alarm is issued to remind the operation staff to pay attention or take intervention measures to prevent abnormal fluctuation of the guide vane opening from causing unit load fluctuation or abnormal unit operation.

[0106] It should be noted that the alarm module 8 is also used to provide early warning of guide vane follow-up faults. Specifically, when the deviation between the guide vane setpoint and the guide vane feedback is greater than 5%, and within a continuous 1-second cycle, the guide vane feedback action direction is opposite or the action rate is less than 1% / s, and a delay of 1.5s occurs, a guide vane follow-up fault occurs.

[0107] The system provided in this embodiment includes: a first guide vane displacement sensor 4, a second guide vane displacement sensor 5, and a third guide vane displacement sensor 6. Using three guide vane displacement sensors can meet the requirement of independent measurement and a three-out-of-two logical judgment method, and to select the optimal value by taking the median value of the three.

[0108] For example, the monitoring submodule 7-1 first collects the real-time operating data of the turbine speed regulation system;

[0109] Then, the fault diagnosis submodule 7-2 determines whether the first guide vane displacement sensor 4, the second guide vane displacement sensor 5, and the third guide vane displacement sensor 6 are faulty based on the operating data.

[0110] Specifically, if the first guide vane displacement sensor 4 reports a fault, then the system diagnoses whether the second guide vane displacement sensor 5 reports a fault. If the second guide vane displacement sensor 5 reports a fault, the system diagnoses whether the second guide vane displacement sensor 5 reports a fault and switches to manual mode. If the second guide vane displacement sensor 5 does not report a fault, the system diagnoses whether the third guide vane displacement sensor 6 reports a fault. If the third guide vane displacement sensor 6 reports a fault, the system switches to manual mode and reports the third guide vane displacement sensor 6 reports a fault. If the third guide vane displacement sensor 6 does not report a fault, the system determines the absolute value A1 of the displacement difference between the second guide vane displacement sensor 5 and the third guide vane displacement sensor 6, and checks whether A1 is greater than a preset deviation value. If so, the system reports a guide vane sampling deviation fault and switches to manual mode; otherwise, the system selects the second guide vane displacement sensor 5 as the primary displacement sensor.

[0111] If the first guide vane displacement sensor 4 does not report a fault, but the second guide vane displacement sensor 5 reports a fault, then the fault of the second guide vane displacement sensor 5 is reported. Then, it is diagnosed whether the third guide vane displacement sensor 6 reports a fault. If the third guide vane displacement sensor 6 reports a fault, then manual mode is switched to manual mode and the fault of the third guide vane displacement sensor 6 is reported. If the third guide vane displacement sensor 6 does not report a fault, then the absolute value A2 of the displacement difference between the first guide vane displacement sensor 4 and the third guide vane displacement sensor 6 is determined. It is judged whether A2 is greater than the preset deviation value. If so, the deviation fault of the second guide vane displacement sensor 5 is reported and manual mode is switched to manual mode. Otherwise, the first guide vane displacement sensor 4 is selected as the main displacement sensor.

[0112] If neither the first guide vane displacement sensor 4 nor the second guide vane displacement sensor 5 reports a fault, but the third guide vane displacement sensor 6 reports a fault, then the fault of the third guide vane displacement sensor 6 is reported. Then, the absolute value A3 of the displacement difference between the first guide vane displacement sensor 4 and the second guide vane displacement sensor 5 is calculated, and it is determined whether A3 is greater than the preset deviation value. If so, the deviation fault of the third guide vane displacement sensor 6 is reported, and manual mode is switched to pure mode. Otherwise, the first guide vane displacement sensor 4 is selected as the main displacement sensor.

[0113] If none of the first guide vane displacement sensor 4, the second guide vane displacement sensor 5, or the third guide vane displacement sensor 6 reports a fault, determine the values ​​of A1, A2, and A3. Check if A3 is greater than a preset deviation value. If not, select the first guide vane displacement sensor 4 as the primary displacement sensor and check if either A1 or A2 is greater than a preset deviation value. If so, report a deviation fault for the third guide vane displacement sensor 6. If A3 is greater than the preset deviation value, check if both A1 and A2 are greater than preset deviation values. If both A1 and A2 are greater than preset deviation values, report deviation faults for both the first and second guide vane displacement sensors. Otherwise, check if A1 is less than A2. If so, select the second guide vane displacement sensor 5 as the primary displacement sensor and report a deviation fault for the first guide vane displacement sensor 4. Otherwise, select the first guide vane displacement sensor 4 as the primary displacement sensor and report a deviation fault for the second guide vane displacement sensor 5.

[0114] In this embodiment, all important signals in the system are sent to the monitoring module 7. Key signals involved in unit control are sent using hard-wiring, while other signals are sent using communication.

[0115] In summary, the turbine speed control system proposed in this embodiment optimizes the fault diagnosis method and strategy of the speed control system based on the original hardware. While controlling costs, it solves the current problems of the cross-redundant speed governor control system, greatly reduces the failure rate of the turbine speed governor, and thus further improves the stability of the unit. This is of great significance for ensuring the safe and stable operation of the generator unit. The solution provided in this embodiment is a technological innovation, and while controlling costs, it has great technical guiding significance for solving similar problems in the industry.

[0116] Example 2

[0117] Figure 7 This is a flowchart of a turbine speed regulation method according to an embodiment of this application, as shown below. Figure 7 As shown, the method includes:

[0118] Step 1: Obtain the control information corresponding to the turbine guide vanes;

[0119] Step 2: Process the control information using the first control signal generation module to obtain the hydraulic control signal for the turbine guide vanes;

[0120] Step 3: Based on the hydraulic control signal, the guide vane switch control module is used to control the switching of the guide vanes, thereby realizing the speed regulation of the turbine.

[0121] When the first control signal generation module fails, the second control signal generation module is used to process the control information.

[0122] In this embodiment of the disclosure, the method further includes:

[0123] Real-time acquisition of operating data of the turbine speed regulation system, and fault diagnosis of the turbine speed regulation system based on the operating data, followed by control of the turbine speed regulation system based on the diagnosis results.

[0124] Specifically, based on the operating data, diagnose whether the PT, gear disc, guide vane, turbine generator power, first proportional servo valve, second proportional servo valve and guide vane switch control module corresponding to the turbine speed regulation system are faulty;

[0125] In addition, based on the operating data, determine the fault type of the PT, toothed disc, guide vane, turbine generator power, first proportional servo valve, second proportional servo valve and guide vane switch control module when they fail;

[0126] In addition, determine the fault level to which the fault diagnosis results belong.

[0127] The fault levels include: Level 1 fault, Level 2 fault, and Level 3 fault;

[0128] The first-level fault is a general fault. When a first-level fault is diagnosed, an alarm needs to be triggered.

[0129] The level 2 fault is a fault in one of the first control signal generation modules or the second control signal generation module. When a level 2 fault is diagnosed, the system switches to the other generation module.

[0130] The Level 3 fault refers to a failure in both the first control signal generation module and the second control signal generation module. When a Level 3 fault is diagnosed, i.e., the machine trips, a shutdown is required.

[0131] In this embodiment of the disclosure, the fault types of the PT include: open circuit fault, jump fault, and deviation fault;

[0132] The fault types of the gear disc include: open circuit fault and jump fault; wherein, the gear disc fault is diagnosed based on the collected gear disc comprehensive signal; when gear disc 2 reports a fault and gear disc 1 does not report a fault, the gear disc comprehensive signal is gear disc 1 signal; when gear disc 1 reports a fault and gear disc 2 does not report a fault, the gear disc comprehensive signal is gear disc 2 signal; when gear discs 1 and 2 do not report a fault, the gear disc comprehensive signal is gear disc 1 signal.

[0133] The fault types of the guide vanes include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, limit overrun fault, and deviation fault.

[0134] The fault types of the hydro-generator unit power include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, and limit over-limit fault.

[0135] The fault types of the first proportional servo valve, the second proportional servo valve, and the guide vane switch control module include: open circuit fault and dead value fault.

[0136] For example, when the current value of the corresponding component is detected to be less than zero or greater than 20mA, it can be determined as a wire breakage fault; when the current value of the corresponding component is detected to jump directly from 6mA to 20mA, it can be determined as a jump fault; when the displacement value output by the displacement sensor is detected to deviate from the predetermined displacement value, it can be determined as a deviation fault, etc.

[0137] In this embodiment of the disclosure, the method further includes:

[0138] Based on the fault diagnosis results, alarms are triggered for the first proportional servo valve or the second proportional servo valve, and / or for the guide vane switch control module, and / or for the active power fluctuation of the hydro-generator unit, and / or for the guide vane fluctuation.

[0139] For example, when the fault diagnosis result is a follow-up fault of the first proportional servo valve or the second proportional servo valve (e.g., the first proportional servo valve or the second proportional servo valve is stuck, the deviation between the guide vane setpoint and the guide vane feedback is greater than 5%, the deviation between the servo feedback and the guide vane control output is greater than 1mA, and the delay is 1.5s), servo switching is performed and a servo valve follow-up fault alarm is issued.

[0140] When the fault diagnosis result indicates a follow-up fault in the guide vane switch control module (i.e., the main pressure regulating valve), (when the deviation between the guide vane setpoint and the guide vane feedback is greater than 5%, the main pressure regulating valve feedback action direction is opposite, or the main pressure regulating valve action stroke is less than 10%, and there is a delay of 1.5 seconds, a servo switch is quickly performed to eliminate the situation where the main valve reports a follow-up fault due to servo jamming or malfunction. If the main pressure regulating valve still cannot operate after servo switch, it can be determined that the main pressure regulating valve is jammed or malfunctioning), a follow-up fault alarm for the guide vane switch control module is issued;

[0141] When the fault diagnosis result shows that the power fluctuation value of the hydro-generator unit exceeds the normal set value, an early warning of active power fluctuation of the hydro-generator unit is issued to remind the operation and duty personnel to pay attention or take intervention measures to prevent excessive power fluctuation of the unit from affecting the stable operation of the power grid.

[0142] When the fault diagnosis result is abnormal fluctuation of the guide vane opening, a guide vane fluctuation alarm is issued to remind the operation staff to pay attention or take intervention measures to prevent abnormal fluctuation of the guide vane opening from causing unit load fluctuation or abnormal unit operation.

[0143] It should be noted that the method also includes providing early warning for guide vane servo failure. Specifically, when the deviation between the guide vane setpoint and the guide vane feedback is greater than 5%, and within a continuous 1-second cycle, the guide vane feedback action direction is opposite or the action rate is less than 1% / s, and a delay of 1.5s occurs, the guide vane servo failure occurs.

[0144] The solution provided in this embodiment uses three guide vane displacement sensors to meet the requirement of independent measurement and selection of two out of three logical judgment methods, and to select the optimal value by taking the median of the three values.

[0145] For example, the monitoring submodule first collects the real-time operating data of the turbine speed regulation system;

[0146] Then, the fault diagnosis submodule determines whether the first guide vane displacement sensor, the second guide vane displacement sensor, and the third guide vane displacement sensor are faulty based on the operating data.

[0147] Specifically, if the first guide vane displacement sensor reports a fault, then the system reports a fault in the first guide vane displacement sensor. Next, it diagnoses whether the second guide vane displacement sensor reports a fault. If the second guide vane displacement sensor reports a fault, the system reports a fault in the second guide vane displacement sensor and switches to manual mode. If the second guide vane displacement sensor does not report a fault, the system diagnoses whether the third guide vane displacement sensor reports a fault. If the third guide vane displacement sensor reports a fault, the system switches to manual mode and reports a fault in the third guide vane displacement sensor. If the third guide vane displacement sensor does not report a fault, the system determines the absolute value A1 of the displacement difference between the second and third guide vane displacement sensors. It then checks whether A1 is greater than a preset deviation value. If so, it reports a guide vane sampling deviation fault and switches to manual mode; otherwise, it selects the second guide vane displacement sensor as the primary displacement sensor.

[0148] If the first guide vane displacement sensor does not report a fault, but the second guide vane displacement sensor does, then report the second guide vane displacement sensor fault. Then, diagnose whether the third guide vane displacement sensor reports a fault. If the third guide vane displacement sensor reports a fault, switch to manual mode and report the third guide vane displacement sensor fault. If the third guide vane displacement sensor does not report a fault, determine the absolute value A2 of the displacement difference between the first and third guide vane displacement sensors. Determine if A2 is greater than a preset deviation value. If so, report the second guide vane displacement sensor deviation fault and switch to manual mode. Otherwise, select the first guide vane displacement sensor as the primary displacement sensor.

[0149] If neither the first guide vane displacement sensor nor the second guide vane displacement sensor reports a fault, but the third guide vane displacement sensor reports a fault, then the third guide vane displacement sensor fault is reported. Then, the absolute value A3 of the displacement difference between the first guide vane displacement sensor and the second guide vane displacement sensor is calculated, and it is determined whether A3 is greater than the preset deviation value. If so, the third guide vane displacement sensor deviation fault is reported, and manual mode is switched to manual mode. Otherwise, the first guide vane displacement sensor is selected as the primary displacement sensor.

[0150] If none of the first, second, or third guide vane displacement sensors report a fault, determine the values ​​of A1, A2, and A3. Check if A3 is greater than a preset deviation value. If not, select the first guide vane displacement sensor as the primary displacement sensor and check if either A1 or A2 is greater than a preset deviation value. If so, report a deviation fault for the third guide vane displacement sensor. If A3 is greater than the preset deviation value, check if both A1 and A2 are greater than preset deviation values. If both A1 and A2 are greater than preset deviation values, report deviation faults for both the first and second guide vane displacement sensors. Otherwise, check if A1 is less than A2. If so, select the second guide vane displacement sensor as the primary displacement sensor and report a deviation fault for the first guide vane displacement sensor. Otherwise, select the first guide vane displacement sensor as the primary displacement sensor and report a deviation fault for the second guide vane displacement sensor.

[0151] In summary, the turbine speed regulation method proposed in this embodiment greatly reduces the failure rate of the turbine governor, thereby further improving the stability of the unit and playing a significant role in ensuring the safe and stable operation of the generator unit.

[0152] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0153] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0154] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A turbine speed control system, characterized in that, include: A turbine governor, comprising a first control signal generation module, a second control signal generation module, and a guide vane switch control module; The first control signal generation module and the second control signal generation module are respectively connected to the guide vane switch control module; Both the first control signal generation module and the second control signal generation module are used to generate hydraulic control signals for the turbine guide vanes and send the hydraulic control signals to the guide vane switch control module. The guide vane switch control module is used to receive the hydraulic control signal and control the opening and closing of the turbine guide vanes based on the hydraulic control signal, thereby realizing the speed regulation of the turbine. When the first control signal generation module fails, the second control signal generation module is used to generate the hydraulic control signal for the turbine guide vanes. The turbine speed control system also includes: a monitoring module; The monitoring module is used to collect real-time operating data of the turbine and turbine governor, perform fault diagnosis on the turbine governor based on the operating data, and then control the turbine governor based on the diagnosis results. The monitoring module includes: a monitoring submodule, a fault diagnosis submodule, and a fault control submodule; The monitoring submodule is used to collect real-time operating data of the turbine and turbine governor; The fault diagnosis submodule is used to diagnose faults in the turbine governor based on the operating data. The fault control submodule is used to control the turbine governor based on the fault diagnosis results; The fault diagnosis submodule includes: a first fault diagnosis unit, a second fault diagnosis unit, and a fault level classification unit; The first fault diagnosis unit is used to diagnose whether the voltage transformer, gear disc, guide vane, turbine generator power, first proportional servo valve, second proportional servo valve and guide vane switch control module involved in turbine speed regulation are faulty based on the operating data. The second fault diagnosis unit is used to determine the fault type of the voltage transformer, toothed disc, guide vane, hydro-generator power, first proportional servo valve, second proportional servo valve and guide vane switch control module according to the operating data; The fault level classification unit is used to determine the fault level to which the fault diagnosis result belongs.

2. The turbine speed regulation system as described in claim 1, characterized in that, The first control signal generation module includes: a first PCC controller, a first power amplifier board, and a first proportional servo valve; The first PCC controller, the first power amplifier board, and the first proportional servo valve are connected in sequence. The first PCC controller is used to send electrical control signals to the first power amplifier board; The first power amplifier board is used to amplify the electrical control signal and send the amplified electrical control signal to the first proportional servo valve. The first proportional servo valve is used to convert electrical control signals into hydraulic signals.

3. The turbine speed regulation system as described in claim 2, characterized in that, The second control signal generation module includes: a second PCC controller, a second power amplifier board, and a second proportional servo valve; The second PCC controller, the second power amplifier board, and the second proportional servo valve are connected in sequence; The second PCC controller is used to send electrical control signals to the second power amplifier board; The second power amplifier board is used to amplify the electrical control signal and send the amplified electrical control signal to the second proportional servo valve; The second proportional servo valve is used to convert electrical control signals into hydraulic signals.

4. The turbine speed regulation system as described in claim 2, characterized in that, The turbine speed control system also includes: a first guide vane displacement sensor, a second guide vane displacement sensor, and a third guide vane displacement sensor; The first guide vane displacement sensor, the second guide vane displacement sensor, and the third guide vane displacement sensor are respectively connected to the guide vane switch control module; The first guide vane displacement sensor, the second guide vane displacement sensor, and the third guide vane displacement sensor are all used to collect the displacement of the turbine guide vanes.

5. The turbine speed control system as described in claim 1, characterized in that, The fault types of the voltage transformer include: open circuit fault, jump fault, and deviation fault. The fault types of the gear disc include: open wire fault and jump fault; The fault types of the guide vanes include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, limit overrun fault, and deviation fault. The fault types of the hydro-generator unit power include: positioning parameter loss fault, wire breakage fault, dead value fault, jump fault, and limit over-limit fault. The fault types of the first proportional servo valve, the second proportional servo valve, and the guide vane switch control module include: open circuit fault and dead value fault.

6. The turbine speed regulation system as described in claim 5, characterized in that, The turbine speed control system also includes: an alarm module; The alarm module is used to perform fault alarms for the first proportional servo valve or the second proportional servo valve based on the fault diagnosis results, and / or fault alarms for the guide vane switch control module, and / or early warning of active power fluctuations in the hydro-generator unit, and / or guide vane fluctuation alarms.

7. A speed regulation method based on the turbine speed regulation system according to any one of claims 1-6, characterized in that, The method includes: Obtain the control information corresponding to the turbine guide vanes; The control information is processed by the first control signal generation module to obtain the hydraulic control signal of the turbine guide vane; Based on the hydraulic control signal, and by using the guide vane switch control module to control the switching of the guide vanes, the speed regulation of the turbine is achieved. When the first control signal generation module fails, the second control signal generation module is used to process the control information.

Images